Non-plused, past participle of non-plus. Synonyms in the same form.
getten, beaten, sticked, graveled, baffled, perplexed, mystified, puzzled, confused, stumped, flustered, embarrassed, confounded, bewildered, amazed, staggered, vexed, stupefied, disconcerted, flummoxed, flurried, addled
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